CV 2012

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Detailed Report for Dr. Walid Tawfik Younes Mohamed

Personal DataName Walid Tawfik Younes Mohamed

Date & Place of Birth 6th

July 1969, Cairo.

Marital Married

Home Address 45, Borhan St., Helwan, Cairo, Egypt.

Present Office Address

Permanent Office address

Department of Physics and Astronomy

King Saud University

PO Box 2455

Riyadh 11451, Saudi Arabia

Tel.: +966-14676611

Fax: +966-14673656

Mob. +966-557977808

National institute of laser enhanced

sciences, NILES, Cairo University, Giza,

Egypt.

Nationality Egyptian

Attached Scientific

- Personal Data & Academic Qualification.

- Research interests

- Referees & references

- professional Experience. - supervision of M.sc. and PhD. Thesis.

- Peer-review activities.

- Publications.

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CURRICULUM VITA

Dr. Walid Tawfik Younes Mohamed

PERSONAL DATA Family name : Mohamed

First Name : Walid Middle Names : Tawfik Younes Email address: [email protected], [email protected] Nationality : Egyptian.

Date and place of Birth : 6th July 1969,Cairo.

Sex : Male.

Marital status : Married

Number of Children : Three Children (12 years old, 9 years old, 5 years old).

Present Job: Associate Professor, Department of Physics of Physics and Astronomy King

Saud University, Saudi Arabia.

Permanent Job: Staff Member (Associate Prof.) at the department of Environmental,

Photochemical and Agriculture Laser applications, NILES, Cairo University, Cairo, Egypt.

KNOWLEDGE OF LANGUAGES: English (Inst. Toefl 540 (A)) writing and speaking excellent.

Deutsch (Primary - secondary school level)

Arabic (Mother tongue language)

Frensh (poor)

Korean (poor)

PROFESSIONAL EXPERIENCE:

(2011-now) Associate Professor, Department of Physics of Physics and Astronomy

King Saud University, Saudi Arabia.

(2010-2011) Research associate (Associate Prof.) Department of Physics,

Pohang University of Science and Technology POSTECH , Pohang, south Korea.

This is a joint project with prof. Ferenc Krausz group at Max Planck Institute of

Quantum Optics (MPQ) Munich, Germany.

(2008 –till now)-Associate prof. –sabbatical leave - at the department of

Environmental, Photo Chemical and Agriculture Laser applications, NILES,

Cairo University, Cairo, Egypt.

(2003- 2009)- Assistant Prof. - academic staff member at the department of

Physics, Faculty of Education for girls, Qurayate, Algouf university, Kingdom of

Saudi Arabia.

(2000-2003)-Lecturer- at the department of Environmental, Photo Chemical and

Agriculture Laser applications, NILES, Cairo University, Cairo, Egypt.

(1999-2000)-Assistant Lecturer- at the department of Environmental Photo

Chemical and Agriculture Laser applications, NILES, Cairo University, Cairo,

Egypt.

(1996-1999)-Physics Specialist- at NILES.

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Teaching Experience: Courses taught at many universities outside NILES.

Atomic & molecular spectroscopy

Laser physics and its applications

Solid state physics I & II

Computer science

C++ programming

Physical Optics

Automatic Analysis Methods

physics of Semiconductors

Electronics and Circuits

Electricity and Magnetism

Modern Physics

General physics

Thermodynamics

Courses taught at NILES, Cairo University * Physical Optics (diploma students).

* Experimental optics (diploma students). * Experimental Projects (M.Sc. students and Ph.D. students).

RESEARCH INTERESTS:

1) Ultrafast laser spectroscopy and its applications.

2) Attosecond streaking and transient absorption spectroscopy of ultrafast electron

motion.

3) Few cycle generation via Supercontinuum in a Gas-Filled Hollow-Core Fiber.

4) Nanoparticles fabrication via ultrafast lasers.

5) Development of ultrashort UV and deep-UV light sources. 6) Laser plasma channels of ionic molecules.

7) Development of new laser-driven, brilliant X-ray sources.

8) Precision spectroscopy of simple atomic systems; laser cooling of atoms; optical

frequency synthesizer (frequency comb); XUV frequency combs. 9) Laser-driven electron acceleration and radiation generation.

10) Laser-Induced Breakdown Spectroscopy (LIBS) applications in both analytical atomic

spectroscopy and plasma spectroscopy.

ACADEMIC QUALIFICATION Field (Physics) Year University

B. SC. 1992 Department of Physics, Faculty of

Science, Cairo University, Giza,

Egypt. M. SC. 1996 Department of Physics, Faculty of

Science, Cairo University, Giza,

Egypt. Ph.D 2000 The experimental part was done at

the Department of Physical Chemistry, TU, Munich, Germany

and the degree is awarded from the

Department of Environmental, Photo

Chemical and Agriculture Laser

applications, NILES, Cairo

University, Giza, Egypt.

Graduation project in 1992 : Plasma Diagnostics Via Interfererometric Laser Holography .

Project Grade : Excellent. Graduation Grade : Good (72%).

Preparation studies Grade for Master of physics Degree (1993):Very Good(80%)

Master thesis title (1996) : Laser Propagation In Water.

Topics of the M.Sc. Thesis (1996): i) The experimental findings and the discussion cited in

this thesis give an evidence for the occurrence of several nonlinear phenomena such as self-

focusing, filamentation, optical-breakdown, cavitations (bubbles) and shock waves, due to propagation of high power Nd: YAG laser beam water.

ii) The self-focusing process is manifested by a luminescent track. The luminescence track

itself; whose length varies inversely with the laser power; is formed due to the appearance of

successively initiated self-focused hot spots' foci each at a distance Zf ,away from the

chamber entrance window. The generated foci appear to have life-times varying between 30-

200 ps.

iii) The experimental findings confirm the theory of Moving foci.

IV) Optical breakdown at self-focusing hot spots gives rise to shock wave propagating at

5km/s and formation of bubbles with diameter about 100-200 rn. Shock wave amplitude

depends on the laser wavelength and power.

Ph.D. thesis title (2000) : Study of the Photon-Molecular Interaction Dynamics Using Short

Laser Pulses : ZEKE Spectroscopy Topics of the Ph.D. Thesis: i) The stability and neutrality of the high Rydberg states

using the role of electric fields in the production of long-lived molecular Rydberg states

which is the basis of the ZEKE (Zero Electron Kinetic Energy) spectroscopy.

ii) Observing long lifetime enhancement (up to ~ 66 s) in the Rydberg states of Benzene

using an experimental method, which externally imposes controlled stabilization of the

Rydberg states using fast switching applied field in case of benzene molecule. The latter is

called 1-locking technique which is applied between the ion optic plates (where the benzene

cation molecules are exist after laser excitation). This l-locking technique is examined for

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both of the 00+

transition and the 61

(3/2) transition of benzene cation molecule by applying

that 1-locking field between the ion optic plates with a variable delay time (100 ns-1

microsecond) with respect to the excitation laser. iii) A maximum enhancement is reached by optimizing the locking field strength at

100mV/cm and the delay time at 100ns after laser excitation. Switching an electric field

which changes its case (on or off) with different delay times after excitation locks the

majority of the Stark mixed levels in states which are free of low-l character.

iv) It is concluded that the ZEKE signal intensity enhancement observed for both of the 00+

transition and the 61

(3/2) transition confirm the assumption that the ions field play an

important role in stabilizing of ZEKE state lifetime.

Ph.D. Advisor: 1- Prof. Dr. E. W. Schlag

TU, Muenchen, Germany

Inst. Of Phys. Chernie Lichtenbergstr 4, 85748 Garching

E-mail: [email protected] ; [email protected]

2- Prof. Dr. Y. E. E. Gamal Professor of laser Physics

Vice dean of NILES Cairo University, Cairo, Egypt.

E-mail: [email protected]

3- Prof. Dr. M. H. Abdel-kader

Professor of Physical Chemistry

Vice dean of NILES

Cairo University, Giza, Egypt.

REFEREES & REFERENCES;

1- Prof. Dr. Mohamad Sabsabi Research Officer

National Research Council Canada

Industrial Materials Institute

75 de Mortagne Blvd.,

Boucherville (Québec) J4B 6Y4

Numéro téléphone : 450-641-5113

Numéro télécopieur : 450-641-5106

[email protected]

Field of research Material analysis using Laser-Induced Breakdown Spectroscopy. Application of the LIBS

technique to the metals, mining, pharmaceutical and environmental sectors.

2- Prof. Dr. Eon Dong Kim

Professor, Physics Department

Director, Center for Attosecond Science and Technology(CASTECH)

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Asian Director, Max Planck Center for Attosecond Science (MPC-AS)

POSTECH Pohang, Kyungbuk 790-784

Republic of Korea

tel: +82 54 279 2089

Fax:+82 54 279 5564

E-mail : [email protected]

Field of research

Ultrafast laser spectroscopy, HHG for Attosecond pulse generation, Nanoscience

inFabrication of Silicon nanowires, and Few cycles generation and stabilization.

3-Prof. Dr. Y. E. E. Gamal Professor of Laser Physics

NILES, Cairo University, Cairo, Egypt.

[email protected]

Tel.:0020101074012 Tel.: 00966507538199

Field of research Theoretical modeling and simulation of Laser-Induced Breakdown Spectroscopy and its

application , specially in gases using shot laser pulses. 3- Prof. Dr. Dr. Tharwat El-sherbini Professor of Laser Physics

Faculty of Science, Physics Department

Laser Physics Lab.

Cairo University, Cairo, Egypt.

Tel.: 0020102501511

E-mail: [email protected]

Field of research

Theoretical modeling and experimental of laser spectroscopy and laser plasma deposition

thin films.

4- Prof. Dr. E. W. Schlag TU, Muenchen, Germany

Inst. Of Phys. Chemie Lichtenbergstr 4 85748 Garching, Phone:+49 89 289 13384

Fax:+49 89 289 13389

E-mail: [email protected] Or : [email protected]

Web: http://www.phys.chemie.tu-muenchen.de/staff/schlag/

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Field of research

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Multiphoton ionization mass spectrometry, High resolution sub-Doppler molecular

spectroscopy and dynamics, ZEKE spectroscopy which include spectroscopy and kinetics of

molecular ions and dynamics of photoexcited states and van der Waal's molecules.

5- Asst. Prof. Ashraf M. Eldakrory Department of Physics,

Faculty of science,

Alqassium university,

Alzolfy, KSA

(Mob. +977501793259)

Email: [email protected]

Field of research

Laser plasma spectroscopy and laser plasma deposition of thin films on nylon-6 .

6- Prof. Mahmoud Abdel-Aty

Department of Mathematics,

Faculty of science,

Bahrain university,

Bahrain Tel.: 0097339839285

E-mail: [email protected]

Web: http://www.abdelaty.tk

Field of research Quantum optics and quantum information, including theoretical modeling of ultra-cold

atoms (Mazer), quantum new states, semiclassical laser theory, quantum entanglement, and

Trapped ions interacting with a laser field. 7-Asst. Prof. Dr. Mostafa Lotfy Abdel-Hady

Department of Physics,

Faculty of Education for girls,

Qurayate, Algouf university,

Kingdom of Saudi Arabia

(Mob. +977500428807)

Email: [email protected]

8- Prof. Dr. Lotfia El-Nadi Professor of laser Physics

Faculty of Science, Physics Department, Laser Physics Lab.

Cairo University, Cairo, Egypt.

E-mail: [email protected]

Field of research

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laser spectroscopy and laser plasma deposition thin films, preparation of metallic and non

metallic thin films under high vacuum evaporation and sputtering techniques.

9- Prof. Dr. Wolfgang Derntroeder

Tel.: (+49-) 1 (0) 631-205-2344

Univ. Kaiserslautem, Fachbereich Physik

Tel.: +49-631-205-2344, Fax: -3903; Raum 46/461)

Erwin-Schroedinger-Str., Geb. 46 E-Mail: [email protected]

D 67663 Kaiserslautem

WWW: http://www.physik.um-kl.de/w_demtro/w_demtro.html

10- Prof. Dr. Dolores Gauyacq

Eaboratoire de Photophysique Moleculaire

Bat.210, Universite de Paris-Sud

91405 ORSAY CEDEX (France)

Tel 33-(0) 169156307

Fax 69156777

E-mail: [email protected]

List of Thesis under Supervision of

Dr. Walid Tawfik Younes Mohamed

Name

Date

Record/award

Title

Degree

1- Marwa Ahmed Mohamed

Ismail

2001

2004

Study of Laser Induced Breakdown

Spectroscopy (LIBS) limit of detection of

some common elements in two different

metallic matrices

M.Sc

2- Asmaa Elhassan Ramadan

Mohamed

2001

2004

Study the effect of static electric field on

Laser induced plasma signal

M.Sc

3- Mohamed soliman

2001

2006

Quantitative elemental analysis

of agricultural drainage water

using laser induced breakdown

spectroscopy.

PhD

4- Abeer Asker

2001

2006

Qualitative and quantitative

analysis of heavy elements

contaminated sediments using

LIBS

M.Sc

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Membership in Scientific Societies :

European Society of Photobiology (since 1997).

The Egyptian Materials Research Society (Eg-MRS) since 2006.

Participation In Scientific Meetings And Conferences *The Honet’11 High Capacity Optical Networks and Enabling Technologies, Riyadh,

Kingdom of Saudi Arabia, December 19-21, 2011.

*The Atto3 conference Sapporo, Hokaido university, Japan 6-9 July 2011. Two posters

“Toward high-order harmonic generation from ions by a femtosecond terawatt laser in

plasma waveguide produced by clustered gas jet” and “ Attosecond light facility constructed

in CASTECH” *The 4th Asian Workshop on Generation and Applications of Coherent XUV and X-ray

Radiation will be held on Jan. 20-21, 2011 at POSTECH, Pohang, Korea.

* The GRDC Symposium 2010 “Green Science and Engineering for Health and Environment” Maria Hall at the Catholic University of Korea in Seoul, Korea 15-16 Nov.

2010.

*First international Conference on Modern Trends in Physics Research MTPR-04, Cairo,

Egypt 4-9 April 2004

*Second Euro-Mediterranean Symposium on Laser Induced Breakdown Spectroscopy,

Hersonissos, Crete, Greece, September 30th – October 3

rd, 2003.

**The 4th Euro-Mediterranean Conference on Laser & photobiology applications in

Medicine and Environment 13-16 Feb. 2001 hold at NILES, Cairo University, Egypt.

***Training course on laser diagnostics of combustion processes organized by

NILES, Cairo University in cooperation with ICS- UNIDO, Trieste , Italy, Cairo,

Egypt, 18Nov.- 22 Nov. 2000.

***Training course on industrial laser application organized by NILES, Cairo

University in cooperation with ICS- UNIDO, Trieste, Italy, Cairo, Egypt, 27

May- 8 June 2000.

**Workshop on laser applications organized by NILES, Cairo University, Egypt, 4-8

Feb.2000.

***Training Course on Laser Science and its applied Technologies organized by NILES Cairo University in cooperation with ICS-UNIDO, Trieste -Italy, Cairo 9-

21 November 1998.

* Winter college on Quantum optics: novel Radiation Sources - Trieste -Italy - 3-21

march 1997. *4

th workshop on Plasma and Laser Physics, Sonesta Hotel, Naser City, Cairo Egypt.26-29

Feb. 1997," Self Focusing and associated Phenomenon induced by high intensity Q-Switched

Nd: YAG Laser Beam in Water",W. Tawfik, A. Abd El-Fattah, Yosr E.E. Gamal and L. El-

.Nadi.

* Participant with paper or poster.

** Member of the organizing Committee.

*** Local Organizer.

PEER-REVIEW ACTIVITIES

Journal reviewer for journal of Sensor Letters (American Scientific Publishers).

Journal reviewer for journal of The Journal of Physical Chemistry

PUBLICATIONS

BOOKS:

Walid Tawfik Mohamed and Jungkwuen An, and Dong Eon Kim, 2012,” Generation

of Few Cycle Femtosecond Pulses via Supercontinuum in a Gas-Filled Hollow-Core

Fiber” published as a chapter in book “"Optical Fibers/ Book 4 InTech , Croatia, ISBN

979-953-307-653-8.

Walid Tawfik Y. Mohamed and Mahmoud Abdel-Aty (Editor), 2007, " Recent

advances in laser induced breakdown spectroscopy as elemental analytical technique

for environmental applications and space exploration" book titled " Aspects of Optical

Sciences and Quantum Information", Research Signpost 37/661 (2), Fort P.O.,

Trivandrum-695 023, Kerala, India, ISBN: 81-308-0147-7.

PAPERS:

A- To be published soon:

1- Guanglong Chen, Tawfik Walid, Xiaotao Geng, Hongxia Xu, Jaehoon Kim and Dong

Eon Kim “A low-intensity femtosecond laser pulse induced plasma waveguide using argon

cluster jet” under submission to Journal of Applied Physics.

B- Published peer reviewed journals:

[1] Walid Tawfik Mohamed, Guanglong Chen, Jaehoon Kim, Geng Xiao Tao1,

Jungkwen Ahn and Dong Eon Kim, 2011, “Controlling the length of plasma waveguide

up to 180 Rayleigh lengths, produced by femtosecond laser pulses in atomic clustered

gas” Optics Express 19(17)15919-15928.

[2] Walid Tawfik Y. Mohamed, 2008, "Improving Detection Limits of trace elements in

Aluminum Alloys using LIBS with a Time-resolved high resolution Echelle

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Spectrometer", Journal of Optics & Laser Technology, Vol. 40, pp.30-38. (one of the best

hot 25 papers ranked by science direct)

[3] Walid Tawfik Younes Mohamed, 2007, "Calibration Free LIBS Identification Of

seawater Salinity", Optica Applicata Vol. 37, No. 1, 5-19.

[4] Walid Tawfik Y. Mohamed, 2007, "Fast LIBS Identification of Aluminum Alloys",

Progress in Physics, Vol. 2, pp. 87-92.

[5] Walid Tawfik Y. Mohamed and Abeer Askar, 2007, "study of the matrix effect on

the plasma characterization of heavy elements in soil sediments using LIBS with a

portable Echelle spectrometer", Progress in Physics, Vol. 1, pp. 47-53.

[6] Walid Tawfik Y. Mohamed, 2007, " Study of the Matrix Effect on the Plasma

Characterization of Six Elements in Aluminum Alloys using LIBS with a Portable Echelle

Spectrometer", Progress in Physics, Vol. 2, pp. 42-49.

[7] Walid Tawfik Younes Mohamed and Ali Saafan, 2006,"Quantitative analysis of

mercury in silver dental amalgam alloy using laser induced breakdown spectroscopy with

a portable Echelle spectrometer", International Journal of Pure and Applied Physics,

Vol.2, No.3, pp. 195-203.

[8] Walid Tawfik Y. Mohamed, 2006," Quantitative elemental analysis of seawater by

laser induced breakdown spectroscopy", International Journal of Pure and Applied

Physics, vol. 2, No.1, pp. 11-21.

[9] Walid Tawfik, Taher Salah, Mahmoud H. Abdelkader, S.A.Hassan and Mohamed A.

Harith, 2006,"Fast analysis of animal feeds using Laser-induced breakdown

spectroscopy", Science Echoes, vol. 6, pp. 19-31

[10] Walid Tawfik, Mohamed A. Harith, Mohamed Elbatanony and Said El-Tayeb,

2006, "Human enamel in ancient (3400-1085 BC) and recent Egypt, Science Echoes, vol.

7, pp. 28-38.

[11] Walid Tawfik, Magdy M. Omar, Yoser E. Gamal and Lotfia El Nadi , 2005, "

Ultrafast moving bubbles of focused laser pulsed in water", American Institute of Physics

AIP conference proceedings, vol. 748, pp. 280-288.

[12] Marwa A. Ismail, Hisham Imam, Asmaa Elhassan, Walid T. Youniss and Mohamed

A. Harith, 2004, “LIBS limit of detection and plasma parameters of some elements in two

different metallic matrices” J. Anal. At. Spectrom. , vol. 19, pp. 1–7.

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[13] M. Sabsabi, V. Detalle, M. Harith, W. Tawfik and H. Imam, 2003, “Comparative

study of two new commercial echelle spectrometers equipped with intensified CCD for

analysis of laser-induced breakdown spectroscopy” Applied Optics, Vol. 42, No. 30, pp.

6094-6098.

[14] M. soliman, W. Tawfik and M. A. Harith, 2003, "quantitative elemental

analysis of agricultural drainage water using laser induced breakdown spectroscopy, First

Cairo conference on plasma physics & applications," Cairo, Egypt, Forschungszentrum

Juelich GmbH, Bilateral Seminars of the International Bureau, Vol. 34, pp. 240-243.

[15] Walid T. Mohamed, Mahmoud H.A. Elkader, Yosr E.E. Gamal and E.W.

Schlag " Long lived High Rydberg States of Benzene as an air pollutant " in proceeding of

the 4th Euro-Mediterranean Conference on Laser & photobiology applications in

Medicine and Environment 13-16 Feb. 2001 hold at NILES, Cairo University, Egypt.

[16] Walied Tawfik, M.M.Omer, Yosr E.E-D Gamal and EL-Nadi (1997)," Photo

dissociation of H2O molecule in intense Laser field " Proceeding of solar energy storage

conference " Solar 97Cairo,Egypt , 6th

Jan. 1997

[17] Walid Tawfik, M.A. Abdelnaser, Yosr E. Gamal, and Lotfia Einadi (1997):

"self-focusing of Nd:YAG laser beam in water" international center for theoretical

physics, Internal Report, MIRAMARE TRIEST, Italy.

[18] WALIED TAWFIK, MAGDY M. OMARA, YOSR E. GAMAL and L. EL –

NADI , (1995) ," Bulk and surface effects in liquids due to interaction of high power

pulsed laser beams ", Proceeding of Femtochemistry: The Lausanna Conference Sept. 4 –

8 Lausanne Switzerland, page 483-490. World scientific.

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